function switchgroup(groupname)
{
	if (document.getElementById) {
		document.getElementById(groupname).style.display = (document.getElementById(groupname).style.display == 'block') ? 'none' : 'block';
	}else if (document.layers) {
		document.layers[groupname].display = (document.layers[groupname].display == 'block') ? 'none' : 'block';
	} else if (document.all) {
		document.all[groupname].style.display = (document.all[groupname].style.display == 'block') ? 'none' : 'block';
	}
}